What type of analysis measures the effects of chemicals over extended periods?

Chronic analysis is designed to measure the effects of chemicals over extended periods, making it the appropriate choice in this context. This type of analysis typically involves long-duration exposure to a substance, often assessing impacts on organisms or ecosystems over weeks, months, or even years. This duration allows for the observation of any cumulative effects that might not be visible in shorter studies.

In contrast, short-term analysis focuses on immediate or short-duration exposure effects, usually assessing impacts over hours or a few days. Acute analysis involves assessing the effects of a substance after a brief exposure, often to determine the immediate toxic effects, while preliminary analysis usually refers to initial assessments or screenings, which do not provide the depth of understanding regarding long-term consequences. Thus, chronic analysis is the most appropriate choice when considering the long-term effects of chemical exposure.